About the fact that at close look at anything 'physical' it becomes just another mathematical property of more fundamental object/phenomena. Does not it seem that all we see and touch (all 'stuff' as you call it) does not 'exist by itself' but is a mathematical consequence of another object/phenomena which in turn is itself a mathematical of another... and so on?

Is not that a "structure without beams or any other physical entities at all - purely mathematical structure we call universe". Yet it has look, touch, mass, color, smell, sound, etc. -which are just various mathematical properties of this structure.

UNQUOTE

It is clear that you have taken a metaphysical position. The position is that 'stuff' is composed of pure 'mathematical consequences'. This position is a metaphysical depiction.

Again, you agree (or at least have agreed) with me that objects (particles, chairs, humans, etc) are reduced to collections of mathematical structures and those structures are not composed of material structures. Mathematical structures cannot die, they cannot decompose, they are not affected by gravity or any other force - they are eternal.